https://devzone.nordicsemi.com/f/nordic-q-a/15219/concurrent-central-and-observer-with-s130I use nrf51822xxac, sdk 9.0.0, sd130. When I connect to some beacon as a central I no longer receive BLE_GAP_EVT_ADV_REPORT and I am not able to receive advertising packets. When mobile phone connects to my device and I am peripheral I still receive en-USTelligent Community 13Wed, 20 Jul 2016 10:18:42 GMThttps://devzone.nordicsemi.com/thread/58131?ContentTypeID=1Wed, 20 Jul 2016 10:18:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:04f2b525-fa9a-4f6a-bf4b-03f1940cfe61Petter Myhre<p>I&#39;m not sure what example you are using, but in for example ble_app_hrs_c the scanning will be stopped when a desired advertisment is recevied, see the handling of the BLE_GAP_EVT_ADV_REPORT event in on_ble_evt(). There you have sd_ble_gap_scan_stop(), and then sd_ble_gap_connect() is called to try to connect. This will start a scan just like with sd_ble_gap_scan_start() only that it will send a connection request if a desired advertisment is received again.</p> <p>When the connection is established, and the DM_EVT_CONNECTION event is received in device_manager_event_handler() the scan will be restarted, see scan_start().</p><div style="clear:both;"></div>